thx mark but i don't understand it, my knowlegde is limited and it doesn't work for me to reseize images each time, sometimes i must make a pic 5 times smaller till it fit....takes to mutch time for me...

If we allow the uploading of images bigger than 512kb the threads will take too long to load and the forum will become too difficult to use. You will need to reduce the file size to 512kb or less yourself before uploading. There is no picture system for phpBB that will reduce the filesize automatically for you - it will only scale the image down to fit the 700x700 pixel limit.